The grappling hook was made from some tube, a spring, 3 roll pins and the arms and head are pieces of pvc pipe, heated and glued together then shaped. Size I obtained by bringing a screen shot up of the belt with grappling hook, blew it up on the screen so the belt measured 90mm then took the measurements of the hook.
The comlink was made from a mic tip and two pvc fittings, then covered with O rings